Battery unit with temperature-regulating means built into the housing

A battery unit comprising:

• a plurality of battery cells or elements grouped together physically and/or electrically in several blocks or modules;
• a housing accommodating and surrounding said cells or elements;
• and
• a means for regulating the temperature of said cells or elements by circulation of heat-transfer fluid,
• wherein the housing is made of a plastic material and comprises:
• a molded bottom tray, with a bottom and lateral walls forming the body of the molded bottom tray as a single molded piece, and
• a top cover, which are assembled together peripherally
• wherein at least the bottom tray has means for distributing and collecting and circulating the heat-transfer fluid which are incorporated structurally in the body of said bottom tray as part of said single molded piece, and
• wherein the means for distribution and collection has at least one duct for supplying heat-transfer fluid, and at least one duct for collecting and discharging heat-transfer fluid, that are arranged on at least a part of a lateral perimeter of the bottom tray and are formed in and/or on an outer face of the walls of the body of said bottom tray,
• wherein the bottom of the bottom tray has at least one circuit for circulation of heat-transfer fluid with extension to a surface thereof, incorporated in the structure of the bottom of the bottom tray and in contact with the cells or elements through internal portion or portions of the walls of said bottom tray, such at least one circuit being subdivided into circuit portions each of which are associated with a module extending under a corresponding module, and in that said at least one circulation circuit is linked to the distribution and collection means and is formed between one or more internal portions of walls of the bottom tray in contact with the cells or elements and the walls of the tray, and
• wherein the circulation means incorporated in the body of the bottom tray are in its bottom between internal portions of a wall and the wall of said bottom tray, and have elementary circulation volumes each formed between an internal portion of wall in contact with the cells or elements and the wall of the bottom tray, with all said elementary circulation volumes linked fluidically either in series to the circulation means, or in parallel to the circulation means.

A battery unit comprising:

• a plurality of battery cells or elements grouped together physically and/or electrically in several blocks or modules;
• a housing accommodating and surrounding said cells or elements;
• and
• a means for regulating the temperature of said cells or elements by circulation of heat-transfer fluid,
• wherein the housing is made of a plastic material and comprises:
• a molded bottom tray, with a bottom and lateral walls forming the body of the molded bottom tray as a single molded piece, and
• a top cover, which are assembled together peripherally
• wherein at least the bottom tray has means for distributing and collecting and circulating the heat-transfer fluid which are incorporated structurally in the body of said bottom tray as part of said single molded piece, and
• wherein the means for distribution and collection has at least one duct for supplying heat-transfer fluid, and at least one duct for collecting and discharging heat-transfer fluid, that are arranged on at least a part of a lateral perimeter of the bottom tray and are formed in and/or on an outer face of the walls of the body of said bottom tray,
• wherein the bottom of the bottom tray has at least one circuit for circulation of heat-transfer fluid with extension to a surface thereof, incorporated in the structure of the bottom of the bottom tray and in contact with the cells or elements through internal portion or portions of the walls of said bottom tray, such at least one circuit being subdivided into circuit portions, and in that said at least one circulation circuit is linked to the distribution and collection means and is formed between one or more internal portions of walls of the bottom tray in contact with the cells or elements and the walls of the tray,
• wherein the circulation means incorporated in the body of the bottom tray have elementary circulation volumes each formed between an internal portion of wall in contact with the cells or elements and the wall of the bottom tray, with all said elementary circulation volumes linked fluidically either in series to the circulation means, or in parallel to the circulation means, and
• wherein said at least one internal portion of wall includes an added plate, tightly secured with the wall of the bottom of the bottom tray, at a corresponding depression or cup thereof, said at least one internal portion of wall being made of a material with high thermal conductivity.